Abstract
The analysis of gas release modes from irradiated materials during out-of-pile temperature transients and of the related microstructure evolution provides fundamental evidence for developing and validating models of the behaviour of gases in solids. Gas atoms are uniformly generated by nuclear reactions in the lattice. If temperature and/or gas concentration increase, gas atoms diffuse and precipitate into bubbles, then bubbles grow and coalesce until they form at grain boundaries porosity networks connected to the free surface. The formation of such percolation paths is related to the appearance of release bursts where most part of the gas inventory escapes. The morphology of percolation patterns determines the porosity limit necessary to start the percolation stage and finally affects the performance of the material in engineering applications. The gas percolation stage in a weakly irradiated beryllium sample, a 2 mm diameter pebble, has been examined by computer aided microtomography based on synchrotron radiation, with the aim to identify and qualitatively characterise the 3D morphology and topology of open porosity networks.
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